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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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UM0934 датащи(PDF) 18 Page - STMicroelectronics |
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UM0934 датащи(HTML) 18 Page - STMicroelectronics |
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18 / 113 page  Physical layer UM0934 18/113 Doc ID 17389 Rev 2 Figure 5. PHY synchronization services 3.6 Additional features The ST7570 embeds additional features in the PHY layer to collect or estimate additional information useful for MAC and upper layers. 3.6.1 Signal and noise estimation The ST7570 performs an estimation of signal and noise on every received physical frame. Two estimations are provided, with different accuracy: ● Raw estimation: performed on PRE+SSD sequence ● Fine estimation: performed on P_sdu. Raw estimation This function provides an estimation of signal and noise amplitudes, as detected by the ST7570 at the RX_IN pin. Signal and noise amplitudes are estimated separately on channel 0 and channel 1 during the preamble (PRE) and SSD sequence (4 bytes). The estimated amplitudes are stored in the MIB objects 000Dh (S0, N0, PGA, Section 6.5.14) and 000Eh (S1, N1, phase, Section 6.5.15) and provided through unsolicited indications (CMD_SynchroIndication, Section 5.3.1, and SPY_SynchroFoundIndication, Section 5.3.20). In order to convert from a raw number (“value” as stored in the MIB) to an RMS voltage value expressed in dB µV, use Equation 1: P_Sync.request P_Sync.indication PHY Layer Embedded MAC layer or external Host Local Node Power Line New time-slot synchronization Current time-slot synchronization Is rejected |
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